To put this into some context: Ory as a product has grown a lot since then, and while it‘s not possible to have „logical user-pool multi-tenancy“ (logical in the sense that it‘s not running multiple instances) on the open source core alone, it certainly is possible on any of the paid-for options!
And generally speaking , there are a couple of examples out there that use the OSS core for multi-tenancy with the deployment scenario, but usually for a finite amount of tenants.
Our thinking behind this is that mostly direct competitors would need true multi tenancy, where every tenant has their own user pools, configs, URLs and so on.